DE19920409A1 - Universal, speed-regulated drilling, thread cutting, widening drill has pedestal with support, stand, vertical adjustment clamp, workpiece arms, one rotatable wrt. other, driven workpiece shaft - Google Patents

Abstract

The drill has a pedestal (11) with an integral workpiece support (12), a rigid cylindrical stand (17), a stroke clamp (19) for vertical adjustment, a pair of arms (32,42) for carrying the workpiece, one rotatable wrt. the other, a hollow shaft arrangement (66) in one arm and a rotatable shaft carrying the workpiece and driven by a motor (61).

Description

The invention relates to a combined drilling, tapping and extension drilling machine and more specifically on such an improved machine that is able to work with un different speeds and speeds to work and the improved Eigen Shafts, which they generally for drilling, extension or broaching and for makes a boring or turning and threading insert suitable.

Since the beginning of industrialization, there has been a need for machines to make holes in herge introduced products, and due to such a need, one was general machine known as a drilling press the result of an early invention. Typically when using such a press a workpiece on the base of an associated Ma  Clamped below a driven drill or drill bit and then the drilling process is carried out. To drill several holes, the parts were placed on sol Chen early machines repositioned relative to the associated drill each time a new hole should be made in this part. To the need for a Neupo device, the next step was to invent a device that is known as a swing drill in which the workpiece has been attached to the base and the drill head itself has been moved relative to the workpiece to make holes in it To introduce a variety of different positions. Nevertheless, the swing drilling machine pointed ne the disadvantage that it was extremely difficult to drill an associated drill at an exact Align drilling position.

As subsequent improvements, the industry has a coordinate drilling machine developed more precise control of movements in the X and Y directions, and still later ter in the Z-axis direction, e.g. B. by an electromechanical device or later through programmable computer-controlled devices (CNC, computer controlled devi ces). However, these latter machines are extremely costly and are therefore not for use in general industrial workshops with modest means settable.

Accordingly, it is the object of the invention to provide an improved drilling, threading and to provide an extension drill of a type in which the drill head is a can be repeatedly positioned relative to a stationary workpiece, around the drill head, compared to sophisticated mechanical devices such as programmable computer ge controlled devices (CNC), exactly with a minimal effort of the operator and with position very low cost. This task is performed by a machine according to the Claim 1 solved.

Another object of this invention is to provide an improved machine of the type described To provide that has a drill head that. manually relative to a stationary Workpiece is movable and the manually operated devices for releasable locking of the drill head in accordance with predetermined points on the workpiece.  

It is another object of this invention to provide an improved, relatively small, yet robust To provide machine of the type described, which has a drill head, the can be quickly and accurately arranged in a variety of positions without a problem significant load on the part of the operator or on related equipment practice and without the accuracy (the vertical alignment) of the corresponding drilling Interfere with tapping or extension drilling.

It is another object of this invention to provide an improved, easy-to-carry machine To provide machines of the type described, in contrast to the machines ideally counteracts the opposite drilling force in their area generated during the drilling process, the operator not during the drilling process must exert an additional force on the workpiece.

Another more specific object of the invention is to provide a machine of the type described above to provide an improved electric motor and a control device tion for this, the operation of the associated tool at different rotation numbers or speeds allowed and that automatically increases the speed to the car keep a fixed torque on a workpiece when an additional load is applied the associated drill is exercised.

Further objects of this invention will become apparent from the description and the appended claims che clearly, especially if they be in conjunction with the accompanying drawings to be sought.

SUMMARY OF THE INVENTION

The machine has a very heavy, cast iron base, one on the upper surface fixed rigid stand in which one end of a cylindrical stand is attached, the extends approximately 61 cm (2 feet) above the base. Two axially spaced Clamps are attached to the stand and surround it adjacent to hers upper end for axial adjustment. The lower clamping device has a wedge, which slidably extends into a vertical keyway that is inserted into the circumference of the stand  is shaped to prevent rotation of the clamp relative to the stand. A Threaded adjusting screw is attached to the rigid stand at its lower end and extends at a distance from and parallel to the stand upwards and into a precise fit Opening in the lower clamp, using a conventional screw drive or thread mechanism is connected. The worm drive mechanism is included connected to a manually operated wheel, which can be rotated around the lower one Optionally raise or lower the clamping device on the stand.

A rear, tool-carrying arm is at one end between the two clamps devices attached to the stand for rotational movement relative to the stand, wherein the opposite end of which comprises a rotatable pivot pin. The top of the Pin is attached in the rear end of the front arm, which is at the upper end of the Hinge pin is attached for rotational movement relative to the rear arm. On his opposite end, an electric motor is attached to the front arm, the Drive shaft is connected to a conventional hollow shaft mechanism to the Shaft around an axis parallel to the axes around which the rear and front arms are turn, drive. The hollow shaft has a conventional tool chuck that is detachable is attached to its lower end and which by means of a manually operated handle is vertically movable relative to a workpiece, the handle entraining with a Hollow shaft mechanism is connected to its shaft down towards the Workpiece and move against the resistance of a torsion spring.

The electric motor is connected to a manually adjustable potentiometer (pot) the motor shaft optionally between 0 to about 3000 revolutions per minute (UPR) to drive. The potentiometer is on the front arm adjacent to a motor attached switch, which can optionally move between two different operating positions is to drive the motor shaft in one direction or the other direction. The Speed or speed of the motor is automatically controlled to a fixed Torque (a fixed torque) on the tool that is then in operation to keep. For example, the engine speed is automatically set when an additional one  Load is applied to a tool insert in order to increase the torque sufficiently, to compensate for the increased drilling resistance exerted on the tool.

Each of the clamps that adjust the vertical adjustment of the rear arm to the stand the control has an associated locking mechanism that can be operated manually Ren arm for releasable locking or unlocking a corresponding clamping device with respect to the stand. Similar locking mechanisms are between the Stand and the rear arm and between the outer end of the rear arm and the rotatable pivot pin to which the front arm is attached. These locks Mechanisms can be operated to prevent the rear arm from moving secure relative to the stand and the pivot pin and the attached front arm secure against rotation relative to the rear arm.

PICTURES

Fig. 1 is a side perspective view of an improved machine of the type described, which has been Herge according to an embodiment of this invention;

Fig. 2 is a partial side elevation of a machine from the opposite side as compared to Fig. 1, with portions of the machine broken away and shown in cross-section;

Fig. 3 is a partial, slightly enlarged partial side view along the line 3-3 of Fig. 1 viewed in the direction of the arrows; and

Fig. 4 is a schematic circuit diagram showing the control for the electric motor used for driving the tool in this invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the following, reference will now be made to the drawing using the reference numerals and first to FIGS. 1 and 2. Reference numeral 10 generally designates an improved drilling, tapping and extension drilling machine which comprises an elongated, generally flat base 11 having a flat, flat base. Adjacent to its front end on its upper surface, the base 11 has an integral Aufspannvor direction or a mounting bracket 12 which has on its surface a plurality of spaced, parallel, rearwardly extending slots 13 , generally in cross section are reversely T-shaped. For reasons discussed below, the base 11 is made of gray cast iron and weighs approximately 109 kg (240 pounds). On the upper surface of the base 11 , adjacent to its opposite end (the rear end of the base), there is also attached a rigid stand support or foot 14 which has a flange 15 which can be used in practice to support the foot 14 to secure to the base 11 , and to secure the base on the upper surface of an associated support or support, such as a machine frame or the like (not shown).

In a circular opening in the skirt or the foot 14 , an elongated, cylin drical machine stand 17 is attached at its lower end, which extends vertically upwards from the base 11 and which has an axially extending groove or keyway 18 in its outer peripheral surface having. For example, the stand is 10.16 cm (4 inches) in diameter, approximately 91.4 cm (3 feet) in length, and can weigh approximately 63.5 kg (140 pounds). For a vertical setting on the stand 17 , the stand surrounding and adjacent to its upper end, two axially spaced clamping devices 19 and 20 are provided. Each of the clamps 19 and 20 has a clamp lock mechanism attached adjacent a diametrical side of the stand 17 , the lock mechanisms being similar in construction and having corresponding manually operated arms or handles 21 and 22 arranged to be in a clamp position, in which the clamping devices are secured against vertical movement on the stand 17 , can be moved in and out of this. The clamping device 19 further includes a wedge (not shown) which slidably extends into the slot 18 in the stand 17 to prevent any unwanted rotation of the clamping device 19 relative to the stand 17 .

An adjusting screw 24 with (acme) trapezoidal thread is rotatably secured at its lower end in the foot 14 adjacent to the stand 17 and extends at a distance parallel to the stand 17 vertically upwards and into an opening which is on the underside of the Klemmvor direction 19 is formed. The adjusting screw 24 is connected in the clamping device 19 with egg nem conventional worm drive mechanism which comprises an output shaft which extends out of the clamping device 19 and which is attached to a lifting handwheel 28 be. The wheel 28 can be operated to vertically move the clamp 19 on the stand 17 when the clamp lock handle 21 is in its released position.

A rear arm 32 supporting the tool is rotatably attached to the stand 17 between the clamps 19 and 20 at its inner end portion. The stand 17 it extends coaxially through a circular opening 33 which is formed in the arm 32 and which has a cylindrical bearing 31 adjacent to its upper end ( FIG. 2) and a radial pressure bearing 35 at its lower end, which is between the arm 32 and the clamping device 19 is arranged. The rear arm 32 is pivotally connected at its opposite outer end (left end in Fig. 2) to the rear or inner end of another arm, a front arm 42 , by means of a cylindrical pivot pin 43 ( Fig. 2). The pin 43 is rotatably secured between its ends in a circular opening 44 formed in the arm 32 adjacent its outer end and has a reduced diameter top end 45 which extends coaxially upward into a precisely fitting circular recess and is fixed therein, the circular recess in the underside of the front arm 42 is ausgebil det at its inner end. A radial thrust bearing 46 surrounds the pivot pin 43 between the arms 32 and 42 ; and the lower end of the pin 43 has a reduced diameter area which is supported by a contact angular contact ball bearing assembly 47 which is fixed in the arm 32 at the lower end of the opening 44 . The arm 32 is thus secured for pivoting and rotating movement (over 360 °) around the stand 17 , while the front arm 42 , which has an integrated grip area 41 , which is formed at its outer end, at its inner end for a pivoting movement with the pin 43 is rela tively attached to the arm 32 . The rotation of the arm 32 relative to the stand 17 is, however, controlled by another locking mechanism which is arranged between the arm 32 and the stand 17 and which is also controlled by a manually operated arm 38 ( FIG. 1). Likewise, movement of the pivot pin 43 in the opening 44 in the arm 32 and accordingly movement of the front arm 42 relative to the arm 32 is controlled by another locking mechanism disposed between the arm 32 and the pivot pin 43 and which, like that above locking mechanism, controlled by a manually operated arm 48 ( Fig. 1).

As shown in FIG. 3, such a typical locking mechanism controlled by arm 48 includes a cylindrically shaped head 49 that is securely attached to one end of arm 48 adjacent one of its outer ends. The head 49 extends at its inner end rotatably and coaxially into one end of a circular opening 51 formed at right angles to the bore 44 in the arm 32 and an opening between its ends at the bore 44 through the arm 32 so that a curved portion of the peripheral surface of the pin 43 extends into the bore 51 on the diametrical side thereof. A stem portion 52 of the reduced diameter head 49 slidably extends through an axial bore in a first cylindrical locking block 53 which is axially insertable into a bore 51 below the head 49 , the stem portion 52 at its opposite end engaging an internally threaded one Screwed hole, which is formed in another cylindrical locking block 54 which can be inserted into the opposite end of the bore 51 . Areas of the inner ends of the blocks 53 , 54 which would protrude beyond the peripheral surface of the pin 43 are cut away, so that corresponding tapered flat surfaces 53 'and 54 ' are formed on the blocks 53 and 54 . These surfaces are arranged so that when the arm 48 rotates the head 49 in one direction, they are pressed into a frictional or clamping relationship with the precisely fitting surface of the pin 43 so that the threaded end of the shaft 42 blocks 52 and 54 to force each other until their tapered surfaces 53 'and 54 ' are frictionally connected to the precisely fitting region of the pin 43 so that the arm 42 is locked against rotation on the arm 32 . When the arm 48 is rotated in the opposite direction, the threaded end of the shaft 52 is partially withdrawn from the bore in the block 54 so that the blocks are allowed to relative to their unlocked positions the pin 43 and the arm 42 to move back.

An electric motor 61 is attached to the upper surface of the outer or front arm 42 adjacent its outer end. The electric motor 61 has an operating spline shaft 62 ( FIG. 2) that extends coaxially downward into a circular opening 63 formed in the outer end of the arm 42 and in driving engagement with the shaft 64 of a conventional hollow shaft assembly extends which is fixed in the opening 63 . The shaft 64 , which extends below the arm 42 at its lower end and has a conventional tool chuck 66 releasably attached thereto, is arranged to be vertically about 5.8 cm (2.0 inches) relative to the arm 42 and an associated setting feed spindle 65 ( Fig. 1) can be moved by a spline provided with a rotatable drive shaft 67 . The drive shaft 67 , which is engaged between its ends in a conventional manner with a hollow shaft arrangement for a drive, can be operated manually by a large number of radial arms 68 which protrude from an earth of the shaft 67 . The shaft 67 is connected at its opposite end to a torsion spring for retracting a hollow shaft, which is arranged under a cap 69 ( FIG. 1) on the arm 42 and which during operation places the hollow shaft arrangement and accordingly the shaft 64 in retracted positions ( Fig. 1) withdraws as soon as the operator releases the arm 68 .

Motor 61 is a reversible 90 volt DC control motor with a permanent magnet and approximately one third horsepower (PS) and is offered for sale by ECM Motor Corporation from Elkhorn, Wi. It is geared towards a 120 or 240 AC power supply and is equipped with a regulator for the load and the operating voltage and with an electronic current limiting system which controls the motor 61 and protects it against overload by limiting the maximum level of the output current . This control results from a printed circuit board (PCM) 71 shown in FIG. 1 and mounted on the upper surface of the arm 42 adjacent the motor 61 . The voltage from the power supply cable C1 is fed into the motor 61 via the printed circuit board 71 and from there via the cable C2.

As is more clearly shown in FIG. 4, the power supply cable C 1 is a three-cable system which has an earth conductor 72 and two live cables 73 and 74 , over which a voltage drop of 120 or 240 V takes place. Conductor 73 is connected to the terminal L1 on the surface of the printed circuit board 71 via a single-pole on / off switch 75 . The other conductor 74 of the power supply C1 is directly attached to another input terminal L2 of the circuit board 71 . The circuit board 71 has output terminals A + and A-, which are connected via corresponding conductors 76 and 77 to the two input terminals of a conventional two-pole switch 78 , with which the direction of rotation of the motor 61 can optionally be reversed. For this purpose, the switch 78 has a conventional, manually operated switch contact 79 (broken line in FIG. 4) which can be switched between two different operating positions on the switch 78 , one of which is the terminals A + and A-, each with one of the two Connects conductors that are carried by the Motorzu guide cable C2, and in the other operating position, the conductors of the cable C2, with which the terminals A + and A- are connected, are connected in reverse. As shown in Fig. 1, the switch 78 is attached to the side of the arm 42 so that its switching contact 79 can be easily moved to one or the other of its two limit positions to change the direction of the rotary motor 61 .

Also shown in FIG. 4, a manually adjustable potentiometer 80 from three transfer conductors 81, 82 and 83, the ver with the terminals P1, P2 and P3 on the circuit board 71 are connected. The potentiometer 80 has a manually rotatable control knob 80 'which, as shown in FIG. 1, is mounted on the side of the arm 42 adjacent to the switch 78 and which is manually adjustable by the revolutions per minute (RPM) of the motor 61 arbitrarily between 0 and about 3000 revolutions per minute. In operation, the output motor speed generated by the circuit board 21 is a linear function of the potentiometer 80 . In addition, conductor 81 of potentiometer 80 is connected to a trimpot (an adjustable resistor) which can be adjusted on circuit board 71 to set a minimum speed speed for motor 61 ; and a line 83 is connected to another trimpot that can be initially set (in the manufacturing facility) to set the maximum speed at which the motor 61 will operate. The conductor 82 of the potentiometer 80 is also connected to another trimpot, which in turn can be adjusted in the production plant in order to improve the load control. Yet another trimpot (not shown) in the circuit board 71 can be set in the manufacturing plant to control the motor 61 and to protect it from overload.

From the foregoing, it will be appreciated that the invention provides an improved, variable speed, universal drilling, tapping, and extension drilling machine which, in conjunction with all of the settings required during movement of its associated tools, from engagement with a workpiece another is extremely accurate. In this context, it will be readily apparent to a person skilled in the art that the tool chuck 66 is designed so that it can take any of a variety of different tools removably therein, e.g. B. a drill, an expansion boring insert, a boring insert and tapping insert, as well as Senkeinsät ze or milling inserts. Since the rigid cast iron base 11 of the machine weighs approximately 109 kg (240 pounds), it satisfactorily compensates for the tendency of the rear arm and the front arm 32 and 42 to exert a very high moment of force on the vertical stand 17 . This stability is also enhanced by the fact that the stand itself weighs approximately 63.50 kg (140 pounds), and because it is secured by the skirt and foot 14 directly to the base 11 , this results in both the base as well as the stand are stabilized. In contrast to fixed devices and regardless of the weight of the base 11 and the stand 17 , the machine 10 has the advantage that it can be transported relatively easily from one machine frame or a support to another if this is desired.

Both the rear and front arms 32 and 42 are movably attached to the stand 17 for horizontal movement and to the outer end of the arm 32 via a pin 43 . In addition, each arm has a spring touch type (Feather Touch Type) for a rotational movement to accurately position the associated tool insert 66 with respect to any workpiece (not shown) that is attached to the carrier 12 . The arms, as far as they have reached their set position, can be locked against further rotary movement by operating the corresponding locking arms 38 and 48 . When the locking arms 21 and 22 have been placed in their unlocked position, the two arms 32 and 42 can be vertically adjusted together on the stand 17 by rotating the lifting handwheel 28 , which is fastened with the threaded adjusting screw 24 . This vertical adjustment of the arms as well as their vertical movements are carried out without in any way affecting the accuracy (in the vertical direction) of any resulting drilling, tapping, extension drilling or boring operation. If, during such operation, the associated tool seizes in the workpiece, the operator need only operate switch 78 to reverse the direction of rotation of the motor, thereby releasing the tool from the associated workpiece if necessary. If the tool does not seize in the workpiece, but instead experiences increased resistance, then the speed control of the motor operates to automatically adjust the speed, maintaining the set torque to accommodate the additional load on the tool compensate.

Those disclosed in the foregoing description, claims and drawings Features can be used individually as well as in any combination for the realization of the invention in its various embodiments may be of importance.

Reference list

10th

Drilling, tapping and extension drilling machine

11

base

12th

Mounting bracket

13

Slits

14

Foot (stand support)

17th

Stand

18th

Keyway

19th

Clamping device

20th

Clamping device

21

Handle

22

Handle

24th

Adjustment screw

28

wheel

31

camp

32

poor

35

Radial thrust bearing

38

Operable arm (handle)

41

Grip area

43

Hinge pin

42

poor

43

Hinge pin

44

opening

45

The End

46

Radial thrust bearing

47

Contact angular contact ball bearing arrangement

48

Operable arm (handle)

49

head

51

opening

52

Shaft area

53

block

54

block

61

engine

62

Operating spline, drive shaft

63

opening

64

wave

65

Adjustment feed spindle

67

drive shaft

68

radial arm

69

cap

71

Circuit board

72

Earth conductor

73

Live cable

74

Live cable

75

On / off switch

76

ladder

77

ladder

78

switch

79

Switch contact

80

Potentiometer

81

Output manager

82

Output manager

83

Output manager

53

'' sloping surface

54

'' sloping surface

80

'' Control button

Claims (15)

A machine for selectively drilling, tapping, or expanding a workpiece, comprising: an elongated, substantially flat, rigid base for removably supporting the base horizontally on a machine frame, the base ( 11 ) having an integral workpiece support ( 12 ) formed on its upper surface adjacent one end and arranged to fix a workpiece thereon, a rigid cylindrical stand ( 17 ) attached at one end to the upper surface of the base adjacent its opposite end is and which protrudes vertically above the base, a lifting clamping device ( 19 ), which is attached to the stand adjacent to one end thereof only for a vertical adjustment, a device ( 28 ) which is adjacent to its opposite end with the clamping device is attached entraining and can be operated manually to the Klemmvo direction to various vertical positions on the stand, a pair of elongated rigid tool-carrying arms ( 32 , 42 ), one of the arms ( 32 ) on the stand adjacent one end thereof by the clamp ( 19 ) for one vertical adjustment, and for rotational adjustment relative to the stand and to the clamping device about an axis parallel to the axis of the stand, devices ( 43 , 45 ) affixing the other arm ( 42 ) adjacent one end thereof to the one Attach arm ( 32 ) adjacent its opposite end for rotational movement relative to the one arm about an axis parallel to the axis of rotation of the one arm and for vertical adjustment with one arm relative to the stand, a hollow shaft assembly ( 64 , 66 ) which is attached in an opening in the other arm ( 42 ), adjacent to its opposite end, and which has a rotatable shaft carrying the tool ( 64 ) which extends parallel to and radially a fixed distance from the axis of rotation of the other arm and which projects at one end under the other arm, around a tool insert which is removably attached thereto, and a reversible electric motor ( 61 ) attached to the opposite end of the other arm and having a drive shaft ( 62 ) extending therefrom into the aperture and drivingly connected to the shaft ( 64 ) for movement about an axis to be transferred parallel to the axis of the stand. 2. The machine of claim 1, comprising a motor control circuit having an AC power supply (C1) and a switch ( 79 ) attached to the other arm ( 42 ) adjacent to the motor and operable manually and selectively, to reverse the direction of rotation of the drive shaft ( 62 ) of the motor ( 61 ) and the shaft attached thereto. The machine of claim 2, wherein the control circuitry further comprises a potentiometer ( 80 ) connected to the motor and having a rotatable control button ( 80 ') attached to the other arm ( 42 ) adjacent the switch ( 79 ) is fixed for manual adjustment in order to either increase or decrease the rotational speed of the motor drive shaft. 4. Machine according to one of the preceding claims, wherein the workpiece support ( 12 ) has in its surface a plurality of spaced, parallel grooves ( 13 ) which are longitudinal to the base ( 11 ) and normal to the stand ( 17 ) extend. 5. Machine according to one of the preceding claims, comprising devices ( 38 ) which are arranged between the stand ( 17 ) and the one arm ( 32 ) and which are manually releasably operable from the outside of the one arm ( 32 ) around the one Lock arm ( 32 ) against rotation relative to stand ( 17 ). 6. Machine according to one of the preceding claims, comprising a device ( 48 , 51-54 ), which is arranged between the one arm ( 32 ) and the other arm ( 42 ) and manually adjacent from outside the one arm ( 32 ) at one end is operable to releasably lock the other arm ( 42 ) against rotation relative to the one arm ( 32 ). 7. Machine according to one of the preceding claims, wherein the fastening device for the other arm ( 42 ) comprises a cylindrical pivot pin ( 43 ) which is fixed at one end in the other arm ( 42 ), adjacent to one end thereof, and which at its opposite end rotatably and coaxially extends into a Kontakttschwenkku gel bearing assembly ( 47 ) which is fixed in a precisely fitting bore which is made in the opposite end of one arm ( 32 ) and which serves the other arm ( 42 ) for to support a rotary setting on one arm ( 32 ). A machine as claimed in claim 6 or 7, which includes a device ( 48 , 51-54 ) for releasably locking the other arm ( 42 ) against rotation relative to the one arm ( 32 ) and comprising a pair of cylindrical locking blocks ( 53 , 54 ) which are fixed coaxially in opposite ends of a circular bore ( 51 ) and which extend through the egg NEN arm ( 32 ) at right angles to the pivot pin, the pivot pin ( 43 ) between its ends an arcuate portion of its Umfangsoberflä che which the part into the circular bore between the ends of which it extends, and comprises a device (52) which the locking blocks (53, 54) miteinan connecting and which is manually operable to selectively blocks (53, 54 ) axially between a non-locking position, in which the opposite ends of the blocks ( 53 , 54 ) are arranged at a distance from the arcuate region of the pin ( 43 ), u nd a locking position in which the opposite ends of the blocks ( 53 , 54 ) are frictionally engaged with the arcuate portion of the pin ( 43 ) to prevent its rotation in one arm ( 32 ). 9. Machine according to one of the preceding claims, wherein the lifting clamping device ( 19 ) comprises one of a pair ( 19 , 20 ) vertically spaced clamping devices which surround the stand ( 17 ) on opposite sides of one end of the one arm ( 32 ) and serve to attach the one arm ( 32 ) in each of the plurality of the various vertical positions to the stand ( 17 ), the device ( 28 ), which is connected to the lifting clamp device, being manually operated, in order to causing movement of the two clamps and one arm ( 32 ) to different vertical positions on the stand ( 17 ), and a device ( 21 , 22 ) for releasably securing the clamp against vertical movement on the stand by a manual operable device is provided. 10. Machine according to one of the preceding claims, which comprises a handle ( 68 ) on the other arm ( 42 ) which is drivingly connected to the shaft ( 64 ) and is angeord net that it is carried and manually moved in one direction is to move the shaft ( 64 ) relative to the other arm ( 42 ) axially downwards and towards the base ( 11 ), and comprises a spring which is inserted between the handle and the shaft and serves to move the shaft ( 64 ) back up relative to the other arm ( 42 ) when the handle is released. 11. Machine according to one of the preceding claims, wherein the reversible motor Drive shaft rotates in a range of approximately 0 to 3000 revolutions per minute and automatically the torque generated by the drive shaft on an associated one Tool insert is exerted increased when the insert has increased resistance through the workpiece in which the tool insert engages. 12. Machine according to one of the preceding claims, wherein the lifting clamping device ( 19 ) engages with the underside of one end of the one arm ( 32 ) and is wedged with the stand ( 17 ) in order to rotate it relative to the stand ( 17 ). to prevent. 13. Machine according to one of the preceding claims, which comprises a thrust bearing ( 46 ) which surrounds the hinge pin ( 43 ) adjacent at one end and arranged between opposite surfaces correspondingly on the one arm ( 32 ) and the other arm ( 42 ) is. 14. Machine according to one of the preceding claims, which comprises a thrust bearing ( 35 ) which comprises the stand ( 17 ) between the ends thereof and between opposite upper surfaces accordingly on the one arm ( 32 ) and the lifting clamping device ( 19 ) is arranged. 15. Machine according to one of the preceding claims, wherein the other Klemmvorrich device comprises the upper surface of one arm ( 32 ) on its side opposite to the side which is in engagement with the lifting clamping device ( 19 ), and wherein a Kugella geranordnung the stand ( 17 ) surrounds and is fixed in a recess in the upper surface of one arm ( 32 ) under the other clamping device.